474 Thirty-fifth Report on the State Museum. 



Formation and locality. In the micaceous sandstones of the 

 Waverly group ; Richfield, Ohio. 



DlCTYOPHYTON TENUE. 



Plate 19, Fig. 5. 



Didyophyton tenue, Hall. Notes on the Family Dictyospongidae ; prelim, 

 for the 35th Kept. N. Y. State Museum Nat. Hist., pi. 18, fig. 5. 1882. 



c 



Cup apparently broadly funnel-shaped : entire form and proportions 

 unknown. Base narrow. 



Surface marked by strong vertical and concentric striae which are 

 comparatively approximate ; the intermediate spaces very finely re- 

 ticulate. The frond is ornamented by broad rounded nodes, pro- 

 duced by the abrupt swelling of the surface. 



The fragment described is about 45 mm. long and 30 mm. wide. 



Formation and locality. In the Waverly group ; Warren, Pa. 



DlCTYOPHYTON (CLATHROSPONGIA) ABACUS. 



Plate 19, Figs. 2-4. 



Clathrospongia abacus, Hall. Notes on the Family Dictyospongidae ; prelim, 

 for the 35th Rept. PL 19, figs. 2-4. 1882. 



Cup turbinate, length a little more than twice the greatest diameter. 

 Base narrow and attenuate. 



Surface marked by vertical and transverse alate expansions, which 

 extend beyond the body for a distance of about eight mm., intersect- 

 ing each other at right angles, and presenting a deeply fenestrate as- 

 pect. The entire surface, both of the body and expansions, is finely 

 reticulate. When the alations are removed, or broken away, their 

 bases leave strong vertical and transverse ridges. There are twelve 

 radiating ridges in the entire circumference of the. cup. 



An imperfect specimen has a length of 100 mm. and a diameter of 

 about 45 mm. at the larger end. 



Formation and locality. In the sandstone of the Waverly group ; 

 Warren, Pa. 



DlCTYOPHYTOK (?) REDFIELDI. 



Plate 18, Fig. 9. 



Dictyophyton Bedfieldi, Hall. Sixteenth Rept. State Cab. Nat. Hist., p. 88, 

 pi. 5, fig. 1, and pi. 5a, fig. 1. 1863. 



Cup subcyiindrical, broader below, gently contracting to a point 

 above the middle of its height, thence abruptly enlarging to a broad 

 flabellate or infundibuliform expansion. Base broader than the body 

 above. 



Surface cancellated by almost equal, strong, thread-like striae, with 

 the intermediate spaces finely reticulate. 



The specimen is imperfect at both extremities, and somewhat com- 

 pressed. The length preserved is 200 mm., the width at base more 



